Process for increasing diameters



March 8, 1949. E. A. J. wARsHYK ETAL 2,463,530

PROCESS FOR INCREASING DIAMETERS Filed May 10, 1946 Ill- -MINE:

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FERD//m/v BY Patented Mar. 8, 1949 PROCESS FOR INCREASING DIAMETERS Edward A. J. Warshyk, Brooklyn, and Ferdinand Daniel, Maspeth, N. Y.

Application May 10, 1946, Serial No. 668,990

(Granted under the act of March 3, 1883, as amended April 30, 1928; 370 0. G. 757) 2 Claims.

This invention relates to a processs for increasing the diameters of shafts.

Previous methods of accomplishing this intended result were slower and more expensive, inasmuch as they required welding, heat treating, and lathe machine Work. The method herein described is fast and economical, requiring a minimum of special equipment and time.

An object of this invention is to provide a method for restoring worn shafts and other members to their original diameters.

Another object is to provide a method for increasing the diameters of shafts.

A further object is to gain useful material properties in a member by bringing a second material into an operative bond with the rst.

Further objects and advantages of this invention will be apparent from the following description and claims in connection with the accompanying drawing, in which Fig. 1 is a front elevational View of a shaft in the initial groove-rolling stage, a portion being shown in vertical section;

Fig. 2 is a front elevational view of a shaft in an intermediate groove-rolling stage, a portion z"A being 4shown in Vertical section;

Fig. 3 is a front elevational view of a shaft in the nal groove-rolling stage, a portion being shown in vertical section, and a portion of a forming roller;

Fig. 4 is a front elevational view of the grooved shaft showing the step of winding wire in the grooves, a portion of the shaft being shown in vertical section for clarity; and

Fig. 5 is a front elevational View of the shaft with increased diameter, a portion being shown in vertical cross section, and showing a portion of a nal pass roller.

Figs. 1, 2, 3, and 4 represent the results of successive steps of the process of this invention in which a shaft Ill is acted on by a roller I I to form a helical groove I2 on the surface of shaft I D.

During application of roller II in this process, the shaft Ill is supported and rotated between the centers of a lathe and the roller II is supported by a suitable member, the supporting bearing surfaces I3 of which are shown in Fig. 3, said member being adapted for attachment to the toolpost of the lathe. The lead screw of the lathe is operated to give a regulated advance to the toolpost for each revolution of the shaft I0, thereby causing the formation of a helical pattern for the groove I2. Said groove I2 is deepened gradually by each of multiple applications of the roller II.

Pieces grooved or upset by rolling as shown in Figs. 1, 2, and 3 have their diameters increased an amount proportionate to the depth of the rolled groove, as indicated at 20. For many purposes such an increase in diameter is satisfactory, and wherever the grooves are not disadvantageous, the shaft Il) as shown in Fig. 3 can be used.

If a smooth surface is desired for the shaft, a length of wire lll is coiled about the shaft Il! in groove i2. The wire I4- is of such size and shape as necessary to conform to the lower sul'- face of groove I2, lling about one half the volume of the recessed groove I2.

When the wire is coiled tightly in the groove I2, a second tool supporting a finishing roller I5 is used to roll the top edges of groove I I until the wire I4 is covered completely and the channel of groove I 2 is closed to form a smooth surface l1, as shown in Fig. 5, where the finishing roller I5 is shown supported by the bearing surfaces I6 of a suitable member.

While the accompanying drawings indicate the use of one roller II to form the groove I2, a plurality of rollers can well be used to form the grooves as herein described. Practice has shown that for larger shaft pieces several rollers, each of the same or different design, accomplish the purpose in a more efcient and economical manner.

Various modifications and changes can be made in the subject device without departing from the scope of the invention.

The invention described herein may be manufactured and used by and for the Government of the United States of America for governmental purposes without the payment of any royalties thereon or therefor.

We claim:

1. The process of increasing the diameter of a malleable cylinder comprising forming a helical groove in a portion of the surface of said cylinder by a rolling operation which hows the material between the grooves outwardly to displace all of the outer surface of the material between the grooves beyond the original diameter of the cylinder, filling the groove partly with an added material, and forcing back into the groove part of the material displaced by said rolling operation without elongating the cylinder.

2. The process of increasing the diameter of a malleable cylinder comprising forming a helical groove in a portion of the surface of said cylinder 3 4 by a series of successive rolling operations which ow the material between the grooves outwardly REFERENCES CITED to displace all of the outer surface of the mate- The following references are of record 1n the rial between the grooves beyond the original dile of this patent: ameter of the cylinder, filling the groove partly with an added material, and forcing back into 5 UNITED STATES PATENTS the groove part of the material displaced by said Number Name Date series of rolling operations without elongating 1,617,122 Kaufman Feb. 8, 1927 the cylinder. 2,375,068 Bennett May 1, 1945 EDWARD A. J. WARSHYK. 1() FERDINAND DANIEL. 

